"Why is she doing a Southern accent? What was that? Is it me? Was she doing a Southern accent? What was that? Not only the hair thing. She's in South Carolina so she threw the accent in there?" said Fox Business' Melissa Francis.

Maybe she was pandering, or maybe she was actually unaware of it. New York Magazine points out, "More than a decade of research ... has shown that people like you more when you start to talk like them ... There's also evidence that people mimic speech and behavior patterns when they're trying to convey a particular message."

Whichever it was, you can be sure the next time Clinton is campaigning in the South, people will be listening closely to her accent.